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Leases - Other Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash paid for leases [Abstract]    
Cash paid for amounts included in the measurement of operating lease liabilities $ 0 $ 3,065
Right Of Use Asset Obtained In Exchange for Lease Liability [Abstract]    
Right-of-use assets obtained in exchange for new operating lease liabilities $ 537 $ 440
Weighted average remaining lease term [Abstract]    
Weighted average remaining lease term- operating leases 5 years 2 months 12 days  
Weighted Average Discount Rate Leases [Abstract]    
Weighted average discount rate - operating leases 4.62%